Unit: Departments of Physics and Chemistry, University of Illinois at Chicago, Chicago IL 60607; Distinguished Chair in the Natural Sciences.
Report time: Wednesday, April 10, 2019 at 14:30 pm.
Address: Lecture Hall, Room 603, Area C, Tang Aoqing Building.
Abstract: extreme pressures and temperatures produce proven effects on structure, bonding and electronic characters of atoms and molecules, molding matter to make new materials. A growing number of novelmaterials and phenomena are being documented over the broad range of conditionsusing bo th static and dynamic multimegabar (e.g., >300 GPa) pressures thatcan now be generated in the laboratory. The results are leading to altogethernew structures, electronic phenomena and potentially useful materials, with implicationsbeyond condensed matter physics to geophysics, planetary physics, astrophysics, and at more modest conditions even biophysics. Because of its quantum characterand putatively simple electronic structure, the behavior of hydrogen has beenof particular interest. Recent studies of hydrogen have uncovered newtransformations to increasingly metallic states i n both the solid and fluidusing static and dynamic compression methods to multimegabar pressures. Therehave also been important recent findings in hydr ogen-rich systems in a varietyof chemical environments at these conditions. Most notable is our discovery ofa new class of materials – superhydrides – and the observation of nearroom-temperature superconductivity in these systems, specifically lanthanumsuperhydrides with a Tc above 260 K near 200 GPa.
Organizer: College of Physics, Jilin University
state key laboratory of superhard materilas
Center for Computational Physics Methods and Software Innovation